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Two Feathered Dinosaurs from Northeastern China

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Two Feathered Dinosaurs from Northeastern China CORE Metadata, citation and similar papers at core.ac.uk Provided by RERO DOC Digital Library articles Two feathered dinosaurs from northeastern China Ji Qiang*, Philip J. Currie†, Mark A. Norell‡ & Ji Shu-An* 8 * National Geological Museum of China, Yangrou Hutong 15, Xisi, 100034 Beijing, People’s Republic of China † Royal Tyrrell Museum of Palaeontology, Box 7500, Drumheller, Alberta T0J 0Y0, Canada ‡ American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024-5192, USA ........................................................................................................................................................................................................................................................ Current controversy over the origin and early evolution of birds centres on whether or not they are derived from coelurosaurian theropod dinosaurs. Here we describe two theropods from the Upper Jurassic/Lower Cretaceous Chaomidianzi Formation of Liaoning province, China. Although both theropods have feathers, it is likely that neither was able to fly. Phylogenetic analysis indicates that they are both more primitive than the earliest known avialan (bird), Archaeopteryx. These new fossils represent stages in the evolution of birds from feathered, ground-living, bipedal dinosaurs. Dinosauria Owen 1842 There are two thin, flat, featureless sternal plates. The clavicles are Theropoda Marsh 1881 fused into a broad, U-shaped furcula (interclavicular angle is about Maniraptora Gauthier 1986 608)asinArchaeopteryx, Confuciusornis and many non-avian Unnamed clade theropods. The forelimb is shorter than the hindlimb. The arm is Protarchaeopteryx robusta Ji & Ji 1997 shorter (compared to the femur) than it is in birds, but is longer than those of long-armed non-avian coelurosaurs such as Holotype. National Geological Museum of China, NGMC 2125 dromaeosaurids and oviraptorids (Table 2). The better preserved (Figs 1, 2 and 3). right wrist of NGMC 2125 has a single semilunate carpal capping Locality and horizon. Sihetun area near Beipiao City, Liaoning, the first two metacarpals. The hand has the normal theropod China. Jiulongsong Member of Chaomidianzi Formation, Jehol phalangeal formula of 2-3-4-x-x. The manus is longer than either Group1. This underlies the Yixian Formation, the age of which the humerus or radius. Compared to femur length, the hand is more has been determined to be Late Jurassic to Early Cretaceous3,4. elongate than those of any theropods other than Archaeopteryx9 and Diagnosis. Large straight premaxillary teeth, and short, bulbous Confuciusornis (Table 2). More advanced birds such as Cathayornis maxillary and dentary teeth, all of which are primitively serrated. have shorter hands10. Phalanges III-1 and III-2 in the hand of Rectrices form a fan at the end of the tail. Protarchaeopteryx are almost the same size, and are about half the Description. The skull of Protarchaeopteryx is shorter than the length of III-3. The unguals are long and sharp, and keratinous femur (Table 1). There are four serrated premaxillary teeth (Fig. 1c), sheaths are preserved on two of them. with crown heights of up to 12 mm. Premaxillary teeth of The preacetabular blade of the ilium is about the same length as coelophysids5, compsognathids6,7 and early birds lack serrations, the postacetabular blade. The pubic boot expands posteriorly. but premaxillary denticles are present in most other theropods. Six Anteriorly, the pubis is not exposed. maxillary and seven dentary teeth are preserved (Fig. 1), all of which The tibia is longer than the femur, as it is in most advanced are less than a quarter the height of the premaxillary teeth. They theropods and early birds. It is not known if the fibula extended to most closely resemble those of Archaeopteryx8 in shape (Figs 1b, c the tarsus. and 2b, c), but have anterior and posterior serrations (7–10 The metatarsals are separate from each other and the distal serrations per mm). tarsals. Metatarsal I is centred halfway up the posteromedial edge The amphicoelous posterior cervicals are the same length as the of the second metatarsal. In perching birds such as Sinornis9, posterior dorsals, which have large pleurocoels. If the lengths of metatarsal I is positioned near the end of metatarsal II and is missing segments of the tail are accounted for, there were fewer than retroverted. Its condition in Archaeopteryx is intermediate. Pedal 28 caudals. Vertebrae increase in length from proximal to mid- unguals are smaller than manual unguals. caudals, as in most non-avian coelurosaurs. A clump of at least six plumulaceous feathers is preserved anterior Table 1 Lengths of elements in Protarchaeopteryx and Caudipteryx Table 2 Relative proportions of elements in relevant avian and non-avian theropods Element NGMC 2125 NGMC 97-4-A NGMC 97-9-A ............................................................................................................................................................................. Element Drom Ov Tro Cx Px Ax Con Body length 690 890 725 ............................................................................................................................................................................. Skull 70 76 79 Arm/F 1.8–2.6 1.5–1.8 1.8 1.5 2.4 3.7 3.9 Sternal plates 25 36 — S/H 0.8 1.0–1.2 — 1.1 — 0.6 0.8 Humerus 88 69 70 R/H 0.7–0.8 0.8–0.9 0.6–0.7 0.9 0.8 0.9 0.8 Arm (humerus to end of phalange II-2) 297 214 220 Manus/H 0.9–1.2 1.2–1.4 1.3 1.2 1.6 1.2 1.3 Ilium 95 101 — Manus/F 1.0 0.7–1.0 0.8 0.6 1.2 1.5 1.6 Ischium — 77 — McI/McII 0.4–0.5 0.4–0.6 0.3 0.4 0.4 0.3 0.4 Leg (femur to end of phalange III-4) 450 550 540 T/F 1.1–1.4 1.2 1.1–1.2 1.2 1.3 1.4 1.1 Femur 122 147 149 Leg/F 3.6 3.3 3.8 3.7 3.7 3.8 3.3 Tibia 160 188 182 Leg/arm 1.4 1.7 2.1 2.5 1.5 1.1 0.8 Tibia 160 188 182 ............................................................................................................................................................................. Metatarsal III 85 115 117 All data were collected from original specimens by P.J.C. Ax, Archaeopteryx; Con, ............................................................................................................................................................................. Confuciusornis; Cx, Caudipteryx; Drom, dromaeosaurids; F, femur; H, humerus; L, length; Length measurements are given in millimetres. NGMC 2125, Protarchaeopteryx; NGMC Mc, metacarpal; Ov, oviraptorids; Px, Protarchaeopteryx; R, radius; S, scapula; T, tibia; Tro, 97.4-A and NGMC 97-9-A, Caudipteryx. troodontids. Nature © Macmillan Publishers Ltd 1998 NATURE | VOL 393 | 25 JUNE 1998 753 articles to the chest, with some showing well-developed vanes (Fig. 3a). Jiahua, vice-premier of China and an avid supporter of the scientific Evenly distributed plumulaceous feathers up to 27 mm long are work in Liaoning. associated with ten proximal caudal vertebrae. Twenty-millimetre Holotype. NGMC 97-4-A (Figs 4 and 5b). plumulaceous feathers are preserved along the lateral side of the Paratype. NGMC 97-9-A (Fig. 5d). right femur and the proximal end of the left femur. Locality and horizon. Sihetun area, Liaoning. Jiulongsong Member Parts of more than twelve rectrices are preserved11 attached to the of the Chaomidianzi Formation. distal caudals. One of the symmetrical tail feathers (Fig. 3b) extends Diagnosis. Elongate, hooked premaxillary teeth with broad roots; 132 mm from the closest tail vertebra, and has a long tapering rachis maxilla and dentary edentulous. Tail short (one-quarter of the with a basal diameter of 1.5 mm. The well-formed pennaceous vanes length of the body). Arm is long for a non-avian theropod; short of Protarchaeopteryx show that barbules were present. The vane is manual claws. Leg-to-arm ratio, 2.5. 8 5.3 mm wide on either side of the rachis. At midshaft, five barbs come Description. The skulls of both specimens of Caudipteryx are off the rachis every 5 mm (compared with six in Archaeopteryx), and shorter than the corresponding femora because of a reduction in individual barbs are 15 mm long. As in modern rectrices, the barbs the length of the antorbital region. The relatively large premaxilla at the base of the feather are plumulaceous. (Figs 6 and 7) borders most of the large external naris. The maxilla and nasal are short, but the frontals and jugals are long. The lacrimal Maniraptora Gauthier 1986 of NGMC 97-4-A is an inverted L-shaped, pneumatic bone. Scleral Unnamed clade plates are preserved in the 20-mm-diameter orbits of both speci- Diagnosis. The derived presence of a short tail (less than 23 caudal mens. The tall quadratojugal seems to have contacted the squamosal vertebrae) and arms with remiges attached to the second digit. and abutted the lateral surface of the quadrate. The single-headed quadrate is vertical in orientation. The ectopterygoid has a normal Caudipteryx zoui gen. et sp. nov. theropod hooklike jugal process. There is a broad, beak-like margin at the symphysis of the dentaries. Posteriorly, the dentary bifurcates Etymology. ‘Caudipteryx’ means ‘tail feather’, ‘zoui’: refers to Zou around a large external mandibular fenestra as in oviraptorids. A Nature © Macmillan Publishers Ltd 1998 754 NATURE | VOL 393 | 25 JUNE 1998 articles R Figure 2 Protarchaeopteryx robusta. a, Outline of the specimen shown in Fig.1a. b, Outline of the left dentary teeth shown in Fig.1b. c, Drawing of the front of the jaws, showing the large size of the premaxillary teeth compared with maxillary and dentary ones. Abbreviations: Co, coracoid; d, dentary; F, femur; f, feathers; Fib, fibula; Fu, furcula; H, humerus; m, maxilla; P, pubis; pm, premaxilla; R, radius; S, scapula; St, sternal plate; T, tibia; U, ulna. Numbers represent tooth positions from front to back. 8 Figure 1 Protarchaeopteryx robusta. a (facing page), NGMC 2125, holotype. Scale bar, 5 cm. b, Fourth to sixth left dentary teeth. Scale bar,1 mm. c, Premaxillaryteeth showing small serrations. Scale bar, 5 mm.
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